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प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
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उत्तर
this criteria is shown by atoms of any matter which may exist alone (like helium) or may not exist alone and exist in molecular form (like oxygen/o₂ )
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संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
The inter-molecular space is maximum in
Differentiate between an atom and a molecule.
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
Define matter. Give four examples of matter.
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Name one solid, one liquid and one gaseous non-metal.
What is meant by saying that non-metals are brittle ?
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Draw a flow-chart for the schematic representation of different types of matter.
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Atoms or groups of atoms having a charge are called ______.
The phenomenon of Evaporation takes place at the ______ of a liquid.
Gas-solid is ______.
Evaporation is always accompanied by ______ in temperature.
